x = int(input())

print("No") if x < 30 else print("Yes") x = int(input()) x int(input()) int input() input print("No") if x < 30 else print("Yes") x < 30 x 30 print("No") print "No" print("Yes") print "Yes" x = int(input()) int(input()) x
x = int(input())

print("No") if x < 30 else print("Yes")